Financial Instruments - Summary of Sensitivity Analysis For Other Investments (Detail) - USD ($) $ in Thousands	12 Months Ended
Mar. 31, 2021	Mar. 31, 2020
Disclosure Of Sensitivity Analysis For Actuarial Assumptions [Abstract]
Annual revenue growth rate, increase in other comprehensive income	$ 424	$ 314
EBITDA Margin, increase in other comprehensive income	265	145
Risk adjusted discount rate, decrease in other comprehensive income	(419)	(280)
Annual revenue growth rate, decrease in other comprehensive income	(414)	(312)
EBITDA Margin, decrease in other comprehensive income	(265)	(145)
Risk adjusted discount rate, increase in other comprehensive income	$ 492	$ 330

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